370 



MR. G. S. BRADY'S MONOGRAPH OF 



liaK the length. Extremities rounded and nearly equal, the anterior slightly narrowed. 

 Ventral margin straight or slightly convex, dorsal arched, somewhat angular in the 

 middle, where it is highest. The outline, as seen from above, is oval, tumid ; width equal 

 to half the length ; extremities rounded and nearly equal ; hinge-margins depressed pos- 

 teriorly so as to form a longitudinal sulcus behind the centre of the carapace. End view 

 circular. The surface is quite smooth and polished ; colour sea-green, faintly mottled 

 with patches of a deeper hue. 



Length ^ in., height in. ,^\r\vw ^ 0 -Ji^fv- 



Cypris trigonella was found by the Rev. A. M. Norman amongst some freshwater 

 shells collected by the late Mr. Barlee. Erom the character of the Mollusca with 

 which it was associated {Planorhis spirorbis and Limncea peregra) we may presume that 

 it was taken probably in the south of England. The gathering contained several 

 specimens of this Cypris, all of them agreeing in size and general character. 



14. Cypris reptans (Baird.) (Plate XXV. figs. 10-14, and Plate XXXVI. fig. 4.) 



Candona reptans, Baird, Trans. Berw. Nat. Club, i. p. 99, t. iii. fig. 11, 1835; and Brit. Entom. p. 160, 



tab. xix. figs. 3, 3a; Jones, Tert. Entom. p. 16, pi. i. figs. 7a-7e. 

 Cypris reptans, Lilljeborg, De Crustaceis, p. 123, tab. xi. figs. 21-23, tab. xii. figs. 7-9. 

 Candona virescens, Brady, Ann. & Mag. Nat. Hist. vol. xiii. p. 61, pi. iv. figs. 1-5, and Trans. Tyneside 



Nat. Field Club, vol. vi. p. 106, pi. iii. figs. 1-5. 



Valves oblong, subreniform, compressed, unequal, the left being considerably the 

 larger. The anterior and posterior margins are obliquely rounded, somewhat angular 

 below, and nearly equal in height, the posterior somewhat the higher. Ventral border 

 slightly sinuated, dorsal straight or very slightly arched. Seen from above, the carapace 

 is compressed, oblong-ovate, widest in the middle, the anterior extremity pointed. End 

 view ovate, prominently keeled in front and below. The surface is smooth and shining, 

 and bears a few scattered hairs. Colour greenish with patches of lighter and darker 

 hue, sometimes banded with orange or brown. The limbs and their terminal claws are 

 all long and slender. Setae of the lower antennae short and rigid, sometimes slightly 

 jDlumose, but mostly quite simple ; the principal bundle rises from the apex of the second 

 joint, and consists of four long and one short seta; an auxiliary brush springs from the 

 middle of the joint, two on the outer, and one on the inner side : none of the setae reach 

 as far as the apices of the terminal claws. The postabdominal rami are long, slender, 

 and serrated on the internal border ; the two larger terminal claws are also serrated in a 

 similar manner. 



Length -^j in., height iii- '^•^ "^^'^ ^ • "^-^ 



A very common species, and (excepting C. hispinosa) the largest of all the British 

 freshwater Ostracoda. It often occurs in very great abundance, especially in the 

 " cooling-ponds" of collieries, &c., where the temperature of the water is higher than 

 ordinary. 



In external appearance, and in habits of life, this species bears much more resem- 

 blance to the Candonce than to the true Cyprides ; but the structure of the lower 



